Modified Circular Common Element 4 Port MIMO Antenna Using Diagonal Parasitic Element

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A 4-port multiple input multiple-output (MIMO) antenna with common radiating element is proposed for 2.4 GHz Wi-Fi applications. It comprises a modified circular radiator fed by four identical modified feedlines, partial ground planes and a diagonal parasitic element (DPE). The parasitic element is used to enhance the inter-port isolation. The antenna has a 2:1 VSWR impedance band 2.34-2.56 GHz and nearly omnidirectional radiation patterns. The radiation efficiency is more than 79 % and gain is 2 dBi at resonant 2.43 GHz. The isolation in the given frequency band is 10 dB. At the 2.43 GHz, the isolation between adjacent ports (1, 2 and 1, 4) is 14 dB and between opposite ports (1, 3) is 12 dB.  The mean effective gain (MEG) ≤-2.7 dB and envelope correlation coefficient (ECC) is < 0.01. The diversity gain is about 10 dB between adjacent ports and the -10 dB total active reflection coefficient (TARC) bandwidth is 202 MHz. To check the effectiveness of Wi-Fi antenna near the human body or head the specific absorption rate (SAR) is observed < 1.6 W/Kg by CST simulation tool.